Rock-drilling machine or engine.



L. L..SCOTT.

11100K DEIELING MACHINE 0E ENGINE.

- APPLIOATION FILED SEPT. 9. 1908. 937,87'2'.

`Panama out.. 26, 1909.

`ITNESSES:

'and compact, simple andy inexpensive, and particularly adapted to mining Worlrin .15,

-chilies or engines, and has for' itsl object vthe production of a machine or engine of t' UNITED s'rAjrnsWENT-perron:

nnwis L. sco'rfr, or Jornrn, Missorrnr.

nook-Dalmine MAcHiNE on ENGINE.

the nature indicated, which shall be small i .stop'es.l l

One feature of thev machine or engine lies in the fact that all inoving'and vital parts are entirely inclosed and are thereby protected from damage consequent upon rough i handling such machines usually receive at j theha-nds of their operators.

l Another featureof a machine or engine constructed 'in accordance with my invention, lies in the fact that all of the energy stored up in the moving parts is used in doing effective Work on the-,drilling tool; thus obtaining the result of a free' piston f Anothenfvaluable feature is that 'the cushj `ion'ing springs arelocated on the outside l ".of theniacliine and are under tlieoperators I .and accomplishing `the results as` hereinaiter.

described, illustrated in the accompanying` I l ure. 1A 'is ahorizont-al plan, shown partly in lmeralszofreference in the several `views.

' sive member.

`observation atalltimes, and canbecasily replaced (should they break), without having to tear' the machine apart.

My invention consists of various features of construction and arrangement of parts,

`drawings and particularly pointed -ontin the appended claims. *l

Whichzforma part of this specification-,-;F1g-

section, of my improved rock drill. .Figa 2 isayertical longitudinal section 'of saine. Figi Sisanend lView ofvFig. l. i VLike parts arev represented b similar nuy. .The numeral 1. represents the `pony/er ,'cyl inder, of ank-internally, fired rock drilling engi-ne. Although'l Wish 'it distinctlyqun vderstood that my invention contemplatesjits adaptation to use iu electric .motor driven drill, 'Where power is applied to a crank shaft to reciprocate the piston, or percusv The cylinder 1 is rotatively i Specification of Letters Patent.-

in the head AV :port-17 is provided nearing. l l *Y projecting 'cylinder Q1: Which-lj is bored yout `Application led September. 9, 1908. Serial No. 452,319.

carried by the casting 2; the Ways orm-a part of the .casting 2 and serve as slides which can be mounted on a shell and tripod supportcominonly used on rockdrills. 'The head 5 closes theiron-t end vof the cylinder 1 and has a cylindrical projection '6 over which vlits the cast-ing 7. Thecastin'g 7 is secured to the cylinder 1 by the studs 8, which `also help to secure the head 5 to the cylinder 1; the outer end of thccas'ting is constructed with a hole of square or polygonal cross section and into it is projected the shank of the drill steel 9, which is lmade of. corresponding section. VThe internal shape-of the casting-7 andthe corresponding external shape of the drill sha-nk compels they drill tool to rotate in unison vWith the power cylinder 1. f v

The head 5 is bored lout to receive the' impact piece 10 which serves for receivingiand transmitting to the drilling tool-'9 the impacts of the reciprocating permissivemem-y ber 11. The impact piece'lOvprojects into the cylinder 1 and is constructed-at its forward end with an enlar ement/1Q, :which prevents 'its entering -lsait cylinder-beyond a certain point.` The casting 7 is bored-out to lit over the projection 6 ofV the .head 5;

and this bore is carried beyond the end of'- the projection 6 so that' the 'enlargement 12 of the impact piecev 10 works in same. The

yshoulder 13 of thecasting 7 fornisa'stop.

for the impact piecelO. Aroundl the im 'pact .piece l0 is formed anvannulangroove 1l. Tliewvater space 1:3 and the groove 14 ofthe impact piccefl() lare'placc-:drin com municat'ion by the radial ports 16, formed in the` impact Apiece l0. f One ormore holes 18 are drilled in the ii'npactfpiece 1O=`Whichv Referring to the accompanyingdrawings* place the annular recess 1st vin -communication withl the hole 17. The drill steel 9 may be constructed with the hole 191Which coincides 'with thehole 17 in '-tliei in'ipa'ct 4piece 10, so'that Water from'the space-.1.5,

(which 'may' be supplied toisaid" space: from to 4tit over the'backlen'd'of'fthe-cylinder '1, and is -slidingly mounted fon.' samer' The shoulder QQ of the cylinder 1-f'orins'1a -stop, (in one directionl, for the crank case 20.v

The crank case 2O carries the journals 23 -iio ofthe crank shaft. 'The crank arms 36 serve as balance wheels and join the main shafts 23 through the pin 24.- vThe piston 11 which yrecipocates in the cylinder 1 is connected to the crank pin 24C through the connecting rod 25, The bolts 26 pass through the lugs 27' of the head 5, also through the lugs 28 of the cylinder l and througlrthe lugs 29 of the crank case 20. The said bolts 26 are secured to the cylinder l and the head 5 by the nuts 30. The bolts 26 project beyond the lugs 29- of the .crank case v2O, and over these projecting ends the coil springs 31 are placed. These springs 31 bear against thel face ofthe lugs 29 and the tension on saine is adjusted by the nuts 32. The springs 31 normally hold the crank case 20 against the shoulder 22 of the cylinder -l for a purpose to be described later.

The external circumference of thefront end of the cylinder 1 is machined round so that the cylindrical casting 2 fits over same,

and said cylinder, (and all parts securedy thereto), arelfree to be rotated in thecasting 2. The shoulder 38 on the cylinder' 1 andthe lugs27 of the head 5 prevent said cylinder l1 from moving longitudinally in the casting 2. The'lever 311 is secured to the cylinder 1 and is used. to rotate said cylinder back and forth. The amount of rotation willdepend on the number of points on the drilling steel; if eight pointed steel is used the amount of rotation required would be back and forth through an arc of v l r The cylinder 1 and all connected parts-are adjustable'by the screw 35, or by some other equivalentor` convenient device, in connection with which the usual shell and tripod.

supportmay be utilized.

The operation of my rock drilling engine rock face and the shank of the drill, (which is made ofsquare or polygonal section), is

projectedV into the piece 7, until it abuts the forward end of the impact piece 10. The

feed screw 35 is then turned until the tool 19 contacts with the rock face, and so 'long as the feed screw' is turned (in one direction),

the drill is kept continuously up to its work. Assuming further that the piston-l1 is being reciprocated, either by some mot-ive power applied tol the shaft 23, or by-action of internally tired gases upon it, (the operation of' the said internally fired engine is that of the .common two cycle, where the charge of gas and air is drawn into the crank case 20, is `compressed and passed int-o the chamber 37 through the .port 38, is then exploded and exhausted in theusual manner), as the piston 11 approaches the end of its downward -stroke it strikesl the inner end of the impact piece 1,0. The impacts of the r'eciproccting percussive member 11-on the inner end of the impact piece 10 are transmitted by the latter to the inner end of the drill steel-9 to penetrate the rock to form the hole. It

will be noted that as the piston 11 strikes' scribed), and will cause the entire 4crank case to yield and move backward, so as to allow the said crank shaft -to pass overits dead center withoutinjury to the bearings or the said crankshaft; after the crank passesy its dead center, the springsl will draw the said crank case back to'its normal position. After the drill is in 'operation the levere, (which is secured to thecylinder l),

is moved back and forth The internal shape of the casting 7 and the corresponding external shape .of the drill steell 9 causes the latter to rotate `in unison with the cylinder 1 so that the position of the cutting edges of the drilling' tool is Varied or altered at each successive blow.v

)Vater may be carried to the extremity of the drill bit as before described.

Having 'thus fully described my invention, what I claim as new and desire to secure by Letters Patent is 1.111 a drill, the combination of a power cylinder, a crank case formed with a tubular projection slidably fitted upon the cylinder,

a shoulder formedupon said cylinder, for limiting the movement of the crank case in one direction, means for yieldingly holding thefree end of said projection in contact with said shoulder, a crank shaft lcarried by the crank case, and a piston connected to the saidshaft and adapted to' reciprocate in the said cylinder', a drill bit carried by the cylinder, and impact 'piece located within the interior ofsaid cylinder directly vproximalto the rear end of bit, and adapted to' strike the said bit, under the action of the piston,

and means for advancing said cylinder and bit'.

2. The'coinbination, in a drill, of an' annular casting, a power cylinder rotatably tted therein and formed with a shoulder, a crank case formed with a tubular projection slidably fitted upon the cylinder, and with a plurality of perforated lugs, bolts secured at one end to' the cylinder and having .their other ends extending through the perforations in said lugs, springs located upon the projecting ends of the bolts and arranged to bear .against said lu s, for normally holding the free ends of sai projection against said 3. The combination, ,of a drill, ot' an an nula'r casting, ai. power cylinder rotatably impacts to the drilling fitted therein, a drill bit ca rried by the cylinder, means for advancing said cylinder and bit, a crank case yieldably connected to said cylinder, a crank shaft carried by t-he-crank case, and a'piston connected to said shaft and arranged to reciprocate in said cylinder.

4. The combination, in a drill, ot an annular casting, a" power cylinder rotatably,

fitted-therein, a crank case yieldably con nected to the rear endfof theV cylinder', a crank shaftcarried. by the crankvcase, an impact piece located in the forward end ot' said cylinder, a drill bit carried bythe cy inder and loosely positionedV in fro-nt'ot' said impact piece, means for compelling` the drill' bit to rotate in iinison with the cylinder, a piston, (connected to the said crank shaft), adapted to reciprocate *in said cylinder and strike the said impact piece, (on its downward stroke), which in ,tuin transmits said oo. '5. In a drill, the combination of a power cylinder, a crank case having a portion thereofslidably itted uponv the cylinder,

yielding connections between .said portion' and said cylinder, for normally -holdmg the crank cage in one position upon the cylinder, adrlll bit carried by the cylinder, 'a' crank shaft carried by the crank case, and a percussive piston operatively connected with the crank shaft.. A

(l. In a drill, the combination of a rotata- .ble p o\\'e1"cylinder, a crank case y'ieldably connected to the cylinder, a crank shaft carried by the crank case, a drill bit carried vby the cylinder and arranged to rotate tl1erewith, an impact piece located within the 1nterior of said cylinder directly proximal the rea-r end of the bit, and a piston connected -with the crank shaft and arranged to strike against the impact piece, the yielding connection between the cylinder and the crank case permitting the latter to move backward at the moment of impact, so as to allow the crank shaft to pass over itsI deadcenter.

- In testimony whereof l hare hereunto Set my hand this 5th Iday ofl September A. l).

LEW'IS L. SCOTT. lVitnesses H. HOWARD, J. H. YOUNG.V 

